The azimuthal coordinate on the surface of a sphere (theta in spherical coordinates) or on a spheroid (in prolate or oblate spheroidal coordinates). Longitude is defined such that 0 degrees=360 degrees. Lines of constant longitude are generally called meridians. The other angular coordinate on the surface of a sphere is called the latitude.

The shortest distance between any two points on a sphere is the so-called great circle distance, which can be directly computed from the latitude and longitudes of two points.

See also

Great Circle, Latitude, Meridian, North Pole, Oblate Spheroidal Coordinates, Prolate Spheroidal Coordinates, South Pole, Sphere, Spherical Coordinates

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Cite this as:

Weisstein, Eric W. "Longitude." From MathWorld--A Wolfram Web Resource.

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